Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A first base station comprising: a processor; and a non-transitory memory, wherein the memory stores instructions, and the processor executes the instructions to cause the first base station to perform the following steps: determining, based on a first measurement report received from a user terminal, a second base station that the user terminal is to preprocess, wherein the preprocessing comprises pre-handover to the second base station or pre-addition of the second base station without data transmission using the second base station, wherein the first base station is connected to the user terminal using a first component carrier, and wherein the first measurement report comprises signal quality information of a current serving cell and signal quality information of a neighboring cell of the current serving cell; sending a first request message to the second base station, wherein the first request message comprises indication information indicating that the user terminal is to preprocess the second base station; determining, in response to receiving a first acknowledgment message from the second base station, that the user terminal is capable of preprocessing the second base station, and sending a preprocessing indication message to the user terminal, wherein the preprocessing indication message comprises information about a second component carrier on which the user terminal performs uplink synchronization with the second base station when performing the preprocessing, and the second component carrier is different from the first component carrier, wherein the preprocessing indication message further comprises security key information between the user terminal and the second base station pre-configured by the first base station for the user terminal, so that when receiving a second indication message from the first base station, the user terminal produces a first intermediate key between the user terminal and the second base station using a second intermediate key between the user terminal and the first base station and the security key information; and sending a first indication message to the second base station to cause the user terminal to be handed over to the second base station for data transmission or to cause the user terminal to add the second base station for data transmission.
Wireless communication systems. This invention addresses the problem of efficiently preparing a user terminal for handover or addition to a new base station. A first base station includes a processor and memory storing instructions. Executing these instructions enables the base station to receive a first measurement report from a user terminal. This report contains signal quality information for the current serving cell and neighboring cells. Based on this report, the base station identifies a second base station for the user terminal to preprocess. Preprocessing involves either a pre-handover or a pre-addition to the second base station without immediate data transmission. The first base station is connected to the user terminal via a first component carrier. The base station then sends a first request message to the second base station, indicating that the user terminal will preprocess it. Upon receiving a first acknowledgment message from the second base station, the first base station confirms the user terminal's capability for preprocessing. Subsequently, it sends a preprocessing indication message to the user terminal. This message includes information about a second component carrier, distinct from the first, for uplink synchronization with the second base station during preprocessing. It also contains pre-configured security key information between the user terminal and the second base station. This allows the user terminal, upon receiving a second indication message from the first base station, to generate a first intermediate key using a second intermediate key and the provided security key information. Finally, the first base station sends a first indication message to the second base station, initiating either a handover for data transmission or an additi
2. The first base station according to claim 1 , wherein the first measurement report comprises a first measurement result corresponding to the current serving cell and a second measurement result corresponding to the neighboring cell of the current serving cell; and the determining, by the first base station based on the first measurement report received from the user terminal, the second base station that the user terminal is capable of preprocessing comprises: in response to determining that the first measurement result is less than a first threshold, determining, based on the second measurement result, at least one base station corresponding to the second measurement result as the second base station that the user terminal is to preprocess, wherein the second measurement result is greater than the first measurement result.
This invention relates to wireless communication systems, specifically improving handover efficiency by enabling user terminals to preprocess neighboring cells before a handover occurs. The problem addressed is the delay and resource overhead in traditional handover processes, where user terminals only begin processing target cells after receiving handover commands. The invention involves a first base station that receives a measurement report from a user terminal. The report includes a first measurement result for the current serving cell and a second measurement result for a neighboring cell. If the first measurement result falls below a predefined threshold, the first base station identifies at least one neighboring base station (corresponding to the second measurement result) as a candidate for preprocessing. The neighboring cell must have a stronger signal than the serving cell to qualify. The user terminal then preprocesses the identified neighboring cell, such as acquiring system information or synchronizing, before a handover command is issued. This reduces handover latency and improves service continuity. The first base station dynamically selects preprocessing candidates based on real-time signal measurements, ensuring efficient resource utilization. The preprocessing step allows the user terminal to prepare for handover in advance, minimizing interruptions during the transition. This approach is particularly useful in high-mobility scenarios or dense network deployments where frequent handovers occur.
3. The first base station according to claim 1 , wherein the processor further executes the instructions to cause the first base station to perform the following steps: receiving a third indication message from the user terminal, wherein the third indication message carries an identifier of the second base station, and the second base station is determined by the user terminal based on a second measurement report; and determining the second base station based on the second measurement report received from the user terminal, and sending the first indication message to the second base station and a second indication message to the user terminal.
This invention relates to wireless communication systems, specifically to a method for managing handover between base stations in a cellular network. The problem addressed is improving the efficiency and reliability of handover procedures, particularly when a user terminal needs to switch from a first base station to a second base station based on signal measurements. The first base station includes a processor that executes instructions to facilitate handover. The user terminal measures signal quality from nearby base stations and generates a second measurement report, which it uses to determine the second base station as the target for handover. The user terminal then sends a third indication message to the first base station, which includes an identifier of the second base station. The first base station receives this message and uses the second measurement report to confirm the second base station as the target. It then sends a first indication message to the second base station and a second indication message to the user terminal to initiate the handover process. This ensures coordinated communication between the base stations and the user terminal, reducing handover delays and improving network performance. The system enhances reliability by validating the target base station before proceeding with the handover.
4. The first base station according to claim 1 , wherein: the first request message further comprises a configuration instruction for configuring information, so that the second base station pre-configures an signaling radio bearer (SRB) and a data radio bearer (DRB) for the user terminal according to the configuration instruction; and both the first acknowledgment message and the preprocessing indication message comprise configuration information of the SRB and configuration information of the DRB.
This invention relates to wireless communication systems, specifically to methods for efficient handover of a user terminal between base stations. The problem addressed is the delay and resource inefficiency in traditional handover procedures, where signaling radio bearers (SRBs) and data radio bearers (DRBs) are established after the handover is completed, leading to service interruptions and wasted resources. The invention describes a first base station that sends a first request message to a second base station to initiate a handover of a user terminal. The request includes a configuration instruction that directs the second base station to pre-configure both an SRB and a DRB for the user terminal before the handover occurs. This pre-configuration allows the user terminal to immediately use the bearers upon handover, reducing latency and improving service continuity. The first base station then receives a first acknowledgment message from the second base station, confirming the pre-configuration of the SRB and DRB. Additionally, the first base station sends a preprocessing indication message to the user terminal, which also contains the configuration information for the SRB and DRB. This ensures the user terminal is prepared to use the pre-configured bearers as soon as the handover is executed. The invention optimizes handover procedures by eliminating the need for post-handover bearer setup, thereby enhancing network efficiency and user experience.
5. The first base station according to claim 1 , wherein the sending the first indication message to the second base station comprises: receiving a second acknowledgment message returned by the second base station, wherein the second acknowledgment message comprises signaling radio bearer (SRB) configuration information and data radio bearer (DRB) configuration information that are pre-configured by the second base station for the user terminal; and sending, to the user terminal, the second indication message that carries the SRB configuration information and the DRB configuration information.
This invention relates to wireless communication systems, specifically to methods for base stations to manage radio bearer configurations during user terminal handover. The problem addressed is the efficient transfer of signaling and data radio bearer (SRB and DRB) configurations between base stations to ensure seamless connectivity for the user terminal during handover. The invention involves a first base station that sends an indication message to a second base station, triggering the second base station to pre-configure SRB and DRB settings for a user terminal. The second base station returns an acknowledgment message containing these pre-configured bearer configurations. The first base station then forwards these configurations to the user terminal via a second indication message, allowing the terminal to establish communication with the second base station without delays caused by post-handover configuration. This approach reduces handover latency by pre-configuring bearers before the terminal connects to the second base station, improving service continuity. The method ensures that both signaling and data bearers are ready immediately upon handover completion, minimizing interruptions in user services. The invention is particularly useful in high-mobility scenarios where rapid handover is critical.
6. The first base station according to claim 1 , wherein: the first request message further comprises indication information for instructing the second base station to establish a signaling radio bearer (SRB), and establish a data radio bearer (DRB) or pre-configure configuration information of a DRB for the user terminal; both the first acknowledgment message and the preprocessing indication message comprise information about the established SRB, and information about the established DRB or the configuration information of the DRB; and when the preprocessing indication message comprises the information about the established SRB and the configuration information of the DRB, the preprocessing indication message further comprises indication information indicating that the second base station has established, based on the configuration information of the DRB, the DRB for the user terminal.
This invention relates to wireless communication systems, specifically improving handover procedures between base stations to reduce latency and signaling overhead. The problem addressed is the inefficiency in traditional handover processes where signaling radio bearers (SRBs) and data radio bearers (DRBs) are established sequentially, causing delays and increased signaling. The invention involves a first base station that sends a request message to a second base station to prepare for a user terminal's handover. The request includes instructions for the second base station to establish an SRB and either a DRB or pre-configure DRB configuration information for the user terminal. The first base station then receives acknowledgment messages from the second base station, which include details of the established SRB and DRB or the DRB configuration. If the acknowledgment includes DRB configuration information instead of an established DRB, the message also indicates that the second base station has created the DRB based on the provided configuration. This approach allows the second base station to pre-establish bearers before the handover, reducing the time and signaling required during the actual handover process. The invention ensures seamless communication continuity by synchronizing bearer setup between the base stations before the user terminal transitions.
7. The first base station according to claim 1 , wherein the execution instruction to enable the device to: send a path switching message to a mobility management entity (MME), so that the MME switches a data transmission path to the second base station.
This invention relates to wireless communication systems, specifically to a method for managing data transmission paths during handover between base stations in a cellular network. The problem addressed is the need for efficient and reliable switching of data transmission paths when a user device moves from one base station to another, ensuring seamless connectivity and minimizing service interruptions. The invention involves a first base station that communicates with a second base station to facilitate handover of a user device. The first base station sends a path switching message to a mobility management entity (MME), which then updates the data transmission path to route traffic through the second base station instead of the first. This ensures that data flows are redirected to the new serving base station after the handover is complete, maintaining continuous service for the user device. The first base station may also receive a handover request from the second base station, prepare resources for the handover, and send a handover command to the user device to initiate the transition. The second base station, after receiving the user device, sends a handover notification to the first base station, confirming the successful transfer. The MME, upon receiving the path switching message, updates the network to reflect the new data transmission path, ensuring that subsequent data is routed correctly. This process optimizes network resource utilization and reduces latency during handover procedures.
8. The first base station according to claim 1 , wherein the preprocessing indication message further comprises a correspondence between a signaling radio bearer (SRB) pre-configured by the second base station for the user terminal and an SRB that is maintained by the user terminal and the first base station, and/or a correspondence between data radio bearer (DRB) pre-configured by the second base station for the user terminal and a DRB that is maintained by the user terminal and the first base station.
In wireless communication systems, seamless handover between base stations is critical for maintaining service continuity. During handover, a user terminal must transition from a source base station to a target base station while preserving existing radio bearers. However, mismatches between pre-configured bearers in the target base station and those maintained by the user terminal can disrupt connectivity. This invention addresses this issue by enhancing handover procedures with additional signaling to ensure bearer consistency. The invention involves a first base station (acting as the target) that sends a preprocessing indication message to a second base station (the source) during handover preparation. This message includes mappings between radio bearers pre-configured by the second base station and those already established between the user terminal and the first base station. Specifically, it provides correspondences for signaling radio bearers (SRBs) and data radio bearers (DRBs). SRBs handle control signaling, while DRBs carry user data. By aligning these bearers, the system ensures that the user terminal can maintain uninterrupted communication during handover. The solution reduces signaling overhead and minimizes service interruptions by avoiding bearer reconfiguration delays. This approach is particularly useful in high-mobility scenarios where rapid handover is essential.
9. A second base station comprising: a processor; and a non-transitory memory, wherein the memory stores instructions, and the processor executes the instructions to cause the second base station to perform the following steps: receiving a first request message from a first base station, wherein the first request message comprises an identifier of a user terminal and indication information indicating that the user terminal is to preprocess the second base station, and the preprocessing comprises pre-handover of the user terminal to the second base station or pre-addition of the second base station without data transmission using the second base station; performing admission control based on the first request message, and returning a first acknowledgment message to the first base station in response to determining that the user terminal is allowed to perform preprocessing; receiving an access request from the user terminal, and synchronizing with the user terminal based on the access request; receiving a first indication message from the first base station, and performing corresponding handover processing based on the first indication message to implement data transmission with the user terminal; producing a second intermediate key between the second base station and the user terminal based on a first intermediate key of the user terminal in the first base station and a first counter value pre-configured by the first base station for the user terminal, and producing a first final key between the second base station and the user terminal based on the second intermediate key, wherein the first final key is used to encrypt data transmitted by the second base station to the user terminal; receiving a key update request message from the first base station; producing a third intermediate key using the first intermediate key of the user terminal in the first base station and a second counter value pre-configured by the second base station for the user terminal, and adding the third intermediate key to a key update response message and sending the key update response message to the first base station, wherein the second counter value is different from the first counter value; and sending a first-base-station key update command to the user terminal, wherein the first-base-station key update command carries the second counter value, so that the user terminal produces the third intermediate key in the first base station based on the first intermediate key and the second counter value, and produces a second final key between the user terminal and the first base station based on the third intermediate key, wherein the second final key is used to encrypt data transmitted by the user terminal to the first base station.
This invention relates to wireless communication systems, specifically to a method for pre-handover or pre-addition of a user terminal to a second base station without immediate data transmission. The problem addressed is the need for seamless and efficient handover or dual connectivity in wireless networks, reducing latency and improving reliability. The second base station includes a processor and memory storing instructions for executing several steps. Upon receiving a request from a first base station, the second base station performs admission control to determine if the user terminal can be preprocessed. If allowed, it returns an acknowledgment and synchronizes with the user terminal upon receiving an access request. The second base station then performs handover processing based on an indication from the first base station, enabling data transmission with the user terminal. Security is managed through key generation. The second base station produces an intermediate key using a pre-configured counter value from the first base station and a final key for encrypting data. Upon receiving a key update request, it generates another intermediate key using a new counter value and sends it to the first base station. The second base station also sends a key update command to the user terminal, allowing it to generate the updated intermediate key and a final key for secure communication with the first base station. This ensures secure and efficient handover or dual connectivity in wireless networks.
10. The second base station according to claim 9 , wherein the first request message further comprises a configuration instruction for configuring information, and the execution instruction to enable the device to pre-configure a signaling radio bearer (SRB) and a data radio bearer (DRB) for the user terminal according to the configuration instruction, wherein the first acknowledgment message comprises configuration information of the SRB and configuration information of the DRB.
In wireless communication systems, efficiently establishing radio bearers for user terminals is critical for maintaining seamless connectivity and service quality. A second base station receives a first request message from a first base station to establish a connection for a user terminal. The first request message includes a configuration instruction for setting up signaling and data radio bearers (SRB and DRB). The second base station processes this instruction to pre-configure the SRB and DRB for the user terminal, ensuring that the necessary communication channels are ready before the terminal transitions to the second base station. The second base station then sends a first acknowledgment message back to the first base station, which includes the configuration details of the SRB and DRB. This pre-configuration allows for faster handover and reduced latency, improving the overall user experience. The system ensures that the user terminal can immediately use the pre-configured bearers upon switching to the second base station, minimizing service interruptions. This approach is particularly useful in scenarios where low-latency communication is essential, such as in mobile broadband or real-time applications.
11. The second base station according to claim 10 , wherein the receiving the first indication message from the first base station, and performing corresponding handover processing based on the first indication message to implement data transmission with the user terminal comprises: establishing the SRB and the DRB between the second base station and the user terminal based on the first indication message, and the configuration information of the SRB and the configuration information of the DRB locally stored in the second base station; and sending a path switching message to a mobility management entity (MME), so that the MME switches a data transmission path to the second base station based on the path switching message.
This invention relates to wireless communication systems, specifically improving handover procedures between base stations to ensure seamless data transmission for user terminals. The problem addressed is the disruption in data transmission during handover, which can lead to service interruptions. The solution involves a second base station that receives an indication message from a first base station, triggering handover processing. The second base station establishes both a Signaling Radio Bearer (SRB) and a Data Radio Bearer (DRB) with the user terminal using locally stored configuration information for these bearers. The SRB handles control signaling, while the DRB manages user data. After establishing these bearers, the second base station sends a path switching message to a Mobility Management Entity (MME), which then updates the data transmission path to route traffic through the second base station. This ensures continuous data transmission during handover, minimizing service disruptions. The invention optimizes handover efficiency by leveraging pre-configured bearer settings and streamlining path switching with the MME.
12. The second base station according to claim 9 , wherein the receiving the first indication message from the first base station, and performing corresponding handover processing based on the first indication message to implement data transmission with the user terminal comprises: sending a second acknowledgment message to the first base station, wherein the second acknowledgment message comprises signaling radio bearer (SRB) configuration information and data radio bearer (DRB) configuration information that are pre-configured by the second base station for the user terminal; establishing an SRB and a DRB between the second base station and the user terminal based on the first indication message and the SRB configuration information and the DRB configuration information; and sending a path switching message to a mobility management entity (MME), so that the MME switches a data transmission path to the second base station based on the received path switching message.
In wireless communication systems, seamless handover of user terminals between base stations is critical for maintaining service continuity. However, existing handover mechanisms often involve complex signaling exchanges, leading to delays and potential service interruptions. This invention addresses these issues by optimizing the handover process between a first and second base station. The second base station receives an indication message from the first base station, triggering handover procedures. In response, it sends an acknowledgment message to the first base station, which includes pre-configured signaling radio bearer (SRB) and data radio bearer (DRB) configuration information for the user terminal. The second base station then establishes both an SRB and a DRB with the user terminal using this pre-configured information, ensuring rapid and efficient bearer setup. Additionally, the second base station sends a path switching message to the mobility management entity (MME), prompting the MME to update the data transmission path to route traffic through the second base station. This streamlined approach reduces handover latency and minimizes service disruptions by leveraging pre-configured bearer settings and direct MME communication. The invention enhances handover reliability and performance in wireless networks.
13. A user terminal comprising: a processor; and a non-transitory memory, wherein the memory stores instructions, and the processor executes the instructions to cause the user terminal to perform the following steps: sending a first measurement report to a first base station, the first measurement report is used to determine a second base station that the user terminal is to preprocess, wherein the preprocessing comprises pre-handover to or pre-addition of the second base station without data transmission using the second base station, wherein the user terminal is connected to the first base station using a first component carrier, and the first measurement report comprises signal quality information of a current serving cell and signal quality information of a neighboring cell of the current serving cell; receiving a preprocessing indication message from the first base station, wherein the preprocessing indication message comprises information about a second component carrier on which the user terminal performs uplink synchronization with the second base station when performing the preprocessing, and the second component carrier is different from the first component carrier; sending based on the preprocessing indication message, a random access request to the second base station on the second component carrier, to implement the preprocessing on the second base station; receiving a second indication message from the first base station, and implementing data transmission between the user terminal and the second base station based on the second indication message; producing a second intermediate key of the user terminal in the second base station based on a first intermediate key in the first base station and a first counter value pre-configured by the first base station for the user terminal, and producing a first final key of the user terminal in the second base station based on the second intermediate key, wherein the first final key is used to encrypt data transmitted by the user terminal to the second base station; receiving a first-base-station key update command from the second base station wherein the first-base-station key update command comprises a second counter value pre-configured by the second base station for the user terminal, and the second counter value is different from the first counter value; and producing a third intermediate key of the user terminal in the first base station based on the first intermediate key and the second counter value, and producing a second final key of the user terminal in the first base station based on the third intermediate key, wherein the second final key is used to encrypt data transmitted by the user terminal to the first base station.
This invention relates to wireless communication systems, specifically improving handover and key management between base stations. The problem addressed is the delay and complexity in traditional handover procedures, particularly in scenarios requiring seamless connectivity and secure data transmission. The solution involves a user terminal that preprocesses a handover or addition of a second base station while maintaining an active connection with a first base station. The terminal sends a measurement report to the first base station, which includes signal quality information of the serving and neighboring cells. The first base station then initiates preprocessing, where the terminal synchronizes with the second base station on a different component carrier without transmitting data. The terminal receives a preprocessing indication message specifying the component carrier for uplink synchronization with the second base station and sends a random access request to complete the preprocessing. Once preprocessing is done, the terminal receives a second indication message to start data transmission with the second base station. The invention also includes a key management mechanism where the terminal generates intermediate and final keys for secure communication with both base stations. The first base station pre-configures a counter value for the terminal, which is used to derive a second intermediate key and a first final key for encrypting data to the second base station. After preprocessing, the second base station sends a key update command with a different counter value, allowing the terminal to derive a third intermediate key and a second final key for encrypting data to the first base station. This ensures secure and efficient handover with minimal interruption.
14. The user terminal according to claim 13 , wherein the preprocessing indication message further comprises signaling radio bearer (SRB) configuration information and data radio bearer (DRB) configuration information that are pre-configured by the second base station for the user terminal; and the receiving the second indication message from the first base station, and implementing communication between the user terminal and the second base station based on the second indication message comprises: receiving the second indication message from the first base station, and establishing an SRB and a DRB between the user terminal and the second base station based on the SRB configuration information and the DRB configuration information, to implement data transmission with the second base station.
This invention relates to wireless communication systems, specifically improving handover procedures between base stations. The problem addressed is the delay and complexity in establishing communication links during handover, which can disrupt data transmission. The solution involves a user terminal receiving a preprocessing indication message from a first base station, which includes pre-configured signaling radio bearer (SRB) and data radio bearer (DRB) settings from a second base station. The terminal then receives a second indication message from the first base station, triggering the establishment of SRB and DRB connections with the second base station using the pre-configured settings. This allows seamless data transmission with the second base station without waiting for post-handover configuration, reducing latency and improving reliability. The invention ensures that the terminal can immediately use the pre-configured bearers upon handover, minimizing service interruptions. The approach is particularly useful in high-mobility scenarios where quick handover transitions are critical.
15. The user terminal according to claim 13 , wherein the second indication message further comprises signaling radio bearer (SRB) configuration information and data radio bearer (DRB) configuration information that are pre-configured by the second base station for the user terminal; and the receiving the second indication message from the first base station, and implementing communication between the user terminal and the second base station based on the second indication message comprises: receiving the second indication message from the first base station, and establishing an SRB and a DRB between the user terminal and the second base station based on the SRB configuration information and the DRB configuration information in the second indication message, to implement data transmission with the second base station.
This invention relates to wireless communication systems, specifically to user terminal handover procedures between base stations. The problem addressed is the efficient establishment of communication links during handover to minimize service interruption. The invention describes a user terminal configured to receive a second indication message from a first base station, where this message includes pre-configured signaling radio bearer (SRB) and data radio bearer (DRB) setup information from a second base station. Upon receiving this message, the user terminal establishes an SRB and DRB with the second base station using the provided configuration, enabling immediate data transmission. This pre-configuration allows faster handover execution by eliminating the need for the user terminal to negotiate bearer setup parameters with the second base station after handover initiation. The solution improves handover reliability and reduces latency in wireless networks, particularly in scenarios requiring seamless connectivity, such as mobile broadband or mission-critical communications. The invention focuses on optimizing the handover process by leveraging pre-configured bearer information to streamline the transition between base stations.
16. The user terminal according to claim 13 , wherein the processor further executes the instructions to cause the second user terminal to perform the following steps: produce a fifth intermediate key of the user terminal in the second base station based on a fourth intermediate key in the first base station and a third counter value pre-configured by the first base station for the user terminal, and producing a third final key of the user terminal in the second base station based on the fifth intermediate key, wherein the third final key is used to encrypt data transmitted by the user terminal to the second base station; receive a first-base-station key update command from the second base station, wherein the first-base-station key update command comprises the fifth intermediate key and the third counter value; and produce a sixth intermediate key in the first base station based on the fifth intermediate key and the third counter value, and producing a fourth final key between the second base station and the user terminal based on the sixth intermediate key, wherein the fourth final key is used to encrypt data transmitted by the user terminal to the second base station.
This invention relates to secure key management in wireless communication systems, specifically for handling key updates during handover between base stations. The problem addressed is ensuring secure and seamless key derivation when a user terminal transitions from a first base station to a second base station, maintaining encryption integrity for data transmission. The system involves a user terminal and multiple base stations. The user terminal includes a processor that executes instructions to perform key derivation and update processes. In the second base station, the processor produces a fifth intermediate key using a fourth intermediate key from the first base station and a third counter value pre-configured by the first base station. This fifth intermediate key is then used to generate a third final key, which encrypts data transmitted by the user terminal to the second base station. The second base station sends a key update command to the first base station, containing the fifth intermediate key and the third counter value. The first base station then derives a sixth intermediate key from these values and generates a fourth final key for secure communication between the second base station and the user terminal. This fourth final key also encrypts data transmitted by the user terminal to the second base station, ensuring consistent security during handover. The process ensures that both base stations and the user terminal synchronize key material, maintaining encryption integrity throughout the handover process.
17. The user terminal according to claim 13 , wherein the preprocessing indication message further comprises indication information for instructing the user terminal to preprocess the second base station, and the user terminal determines, based on the indication information, to maintain a connection to the first base station.
This invention relates to wireless communication systems, specifically to a user terminal that manages connections between multiple base stations during handover procedures. The problem addressed is the need for efficient and reliable handover between base stations while minimizing service interruptions and resource usage. The user terminal is configured to receive a preprocessing indication message from a first base station, which includes instructions for preparing a handover to a second base station. The message contains indication information that directs the user terminal to preprocess the second base station, which may involve tasks such as measuring signal quality, synchronizing with the second base station, or allocating resources. Based on this indication, the user terminal determines whether to maintain its connection to the first base station while preparing for the handover. This ensures that the user terminal can seamlessly transition between base stations without losing connectivity, improving reliability and user experience. The preprocessing steps help optimize resource allocation and reduce latency during the handover process.
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March 17, 2020
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